gui: Design & UI for AI Agents | OpenAgentSkill

Overview

Cross-driver GUI actuation for CAE solvers running under sim-cli. Use to click buttons, fill fields, dismiss dialogs, and capture window screenshots against GUI-capable driver windows through `sim exec`.

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`gui` — cross-driver GUI actuation

Whenever the active driver runs with ui_mode=gui (or desktop), sim serve injects a gui object into your sim exec namespace alongside session / solver / meshing / model. The object is the same shape across solvers — only the process filter differs — so one skill serves every GUI-capable driver.

/connect advertises it:

{
  "ok": true,
  "data": {
    "...": "...",
    "tools": ["gui"],
    "tool_refs": {"gui": "sim-cli/_skills/sim-cli/gui/SKILL.md"}
  }
}

If tools doesn't contain "gui", the driver launched headless and the object is absent — don't call it.

When to reach for `gui`

Three scenarios dominate:

A blocking dialog is wedging the workflow. A login prompt, overwrite confirmation, or script-error dialog can pause agent work until someone clicks a button — that someone is you, via gui.
You need to drive the GUI where the SDK can't. Some workflows expose a UI-only surface that the driver API does not cover.
You need a per-window screenshot. sim screenshot captures the whole desktop. SimWindow.screenshot() captures just the window you care about — cheaper to read, less visual clutter for the LLM.

If the SDK has a programmatic path (session.tui.*, model.solve(), ModelUtil.loadCopy()), prefer that. gui is for the UI-only surface that the SDK doesn't cover.

Remote equivalence

gui is in the session namespace on the sim serve side. You talk to it via the existing /exec HTTP channel:

# local Windows box
sim exec "dlg = gui.find('Login'); dlg.click('OK')"

# Windows box on the LAN / Tailscale
sim --host 10.0.x.y exec "dlg = gui.find('Login'); dlg.click('OK')"

No new endpoint, no new protocol — the same API shape from anywhere the agent runs.

Requirement on the server host: sim serve must run in a real interactive desktop session (normal login or RDP). Windows service / SSH session 0 has no desktop, so pywinauto can't enumerate any windows even though the solver processes are running. This is the same constraint GUI-capable drivers document.

API

Discover what the controller is looking at

gui.available          # True iff pywinauto can run — check before driving anything
gui.process_filter     # tuple of process-name substrings this gui will target
gui.list_windows()     # {ok, windows: [{hwnd, pid, proc, title, rect}, ...]}

Find a window (polled until timeout)

dlg = gui.find(title_contains="Login", timeout_s=5)
# returns a SimWindow, or None on timeout

title_contains is a plain substring match (case-sensitive, any language). Returns None if nothing matched — always check before calling methods on it:

dlg = gui.find("连接到")
if dlg is None:
    _result = {"ok": False, "error": "login dialog not visible"}
else:
    dlg.click("确定")

Act on a window

Every action returns {ok: bool, ...}. No exceptions unless you pass invalid Python types — surface ok=False + error to the agent.

dlg.click("OK", timeout_s=5)             # click a button by accessible name
dlg.send_text("alice", into="Username")  # type into a named Edit field
dlg.send_text("/tmp/out.cas.h5")         # without `into` → first editable
dlg.close()                              # WM_CLOSE (Alt+F4 equivalent)
dlg.activate()                           # bring to foreground
dlg.screenshot(label="after_login")      # window-only PNG under workdir

Each action method tries the most natural pywinauto strategy first (button_by_title) and falls back to a broader match (any_control_by_title) before giving up — the response tells you which path worked via the strategy field.

Full UIA dump

Expensive but sometimes necessary for reasoning about an unfamiliar GUI:

state = gui.snapshot(max_depth=3)
# {ok, windows: [{hwnd, pid, proc, title,
#                  controls: [{name, control_type, handle, children?}, ...]}]}

Use this when find(title) misses and you need to see what the GUI actually exposes.

Handle metadata

SimWindow fields you can read without another round-trip:

dlg.hwnd     # int
dlg.pid      # int
dlg.proc     # str, process name
dlg.title    # current window title
dlg.as_dict() # {hwnd, pid, proc, title, rect}

Typical patterns

dlg = gui.find(title_contains="Login", timeout_s=5)
if dlg:
    dlg.send_text("alice", into="Username")
    dlg.send_text("secret", into="Password")
    dlg.click("OK")
_result = {"dismissed": dlg is not None}

Pattern 2 — confirm a "file exists, overwrite?" dialog

dlg = gui.find(title_contains="Question", timeout_s=3)
if dlg is None:
    dlg = gui.find(title_contains="overwrite", timeout_s=3)  # other
if dlg:
    dlg.click("OK")
_result = {"confirmed": dlg is not None, "title": dlg.title if dlg else None}

Pattern 3 — walk the solver UI tree to find an unexpected control

state = gui.snapshot(max_depth=4)
names = []
def walk(items):
    for c in items:
        if c.get("name"):
            names.append((c["control_type"], c["name"]))
        walk(c.get("children") or [])
for w in state["windows"]:
    walk(w.get("controls") or [])
_result = {"control_names": names[:50]}

Pattern 4 — capture only the solver window for the agent to read

dlg = gui.find(title_contains="Main", timeout_s=3)
if dlg:
    shot = dlg.screenshot(label="after_solve")
    _result = shot  # contains {ok, path, width, height}
else:
    _result = {"ok": False, "error": "main window not found"}

Error handling

Every call returns a dict; failures look like {"ok": False, "error": "connect(handle=...) failed: ..."}. The UIA machinery runs in an isolated subprocess so a COM glitch in one call never poisons the next.

Things that commonly make ok false:

Symptom	Likely cause	What to do
`find` returns `None`	title didn't match / process filter too strict	print `gui.list_windows()` to see what is live
`click` says `no control titled ... in hwnd=...`	the button label in the UI is not what you think	snapshot the window, read `controls[*].name`
`screenshot` returns minimal PNG	window is minimized (pywinauto captures the window rect; min'd windows live at `(-32000, -32000, …)`)	`dlg.activate()` first, then screenshot
`gui.available` is `False`	off-Windows host, or pywinauto not installed	don't use `gui` — fall back to SDK-only path
`list_windows()` returns `[]` even though the solver clearly launched	`sim serve` was started from an SSH / non-interactive Windows session — the GUI exists in a session with no display surface and pywinauto can't see it	ask the operator to restart `sim serve` from a desktop session (RDP, Windows Terminal, or Task Scheduler with "run only when user is logged on" + interactive). See `../SKILL.md` → "Where `sim serve` runs". Do not retry.
`screenshot` returns a uniformly black PNG	same as above — non-interactive session has no compositor	same fix

Pitfalls

Don't guess button labels. Windows localisation is real. Use gui.snapshot() to confirm the actual accessible name before calling click(name).
Don't assume single window. Some solvers open extra floating panels. find(title) returns the first match; if the workflow is ambiguous, use list_windows() and pick by pid.
Don't rely on gui for SDK-shaped work. Solver objects (session, model) are always faster and more reliable than UI clicks. gui is the fallback for the UI-only surface.
Remote servers need a real desktop. If sim serve runs from an SSH session, a Windows service, or any non-interactive context, the spawned solver process inherits a session with no display surface. pywinauto then finds zero windows, screenshots come back uniformly black, and find(...) silently times out — the server itself is up and reachable, only the GUI half is dead. Restart sim serve from a desktop session (Windows Terminal on the console, RDP, or Task Scheduler with "run only when user is logged on" + interactive). See ../SKILL.md → "Where sim serve runs" for the full driver-by-driver matrix.

Plugin-specific skills list the dialogs that a given driver is known to pop. Check those for recipes before inventing your own.
sim.inspect probes (issue #8a window_observed, #8b screenshots) tell you what is on screen — read them first, then reach for gui to act.

View source ↗

File metadata

name: gui
description: Cross-driver GUI actuation for CAE solvers running under sim-cli. Use to click buttons, fill fields, dismiss dialogs, and capture window screenshots against GUI-capable driver windows through `sim exec`.
type: tool

View original text

---
name: gui
description: Cross-driver GUI actuation for CAE solvers running under sim-cli. Use to click buttons, fill fields, dismiss dialogs, and capture window screenshots against GUI-capable driver windows through `sim exec`.
type: tool
---

# `gui` — cross-driver GUI actuation

Whenever the active driver runs with `ui_mode=gui` (or `desktop`),
`sim serve` injects a **`gui`** object into your `sim exec` namespace
alongside `session` / `solver` / `meshing` / `model`. The object is the
same shape across solvers — only the process filter differs — so one
skill serves every GUI-capable driver.

`/connect` advertises it:

```json
{
  "ok": true,
  "data": {
    "...": "...",
    "tools": ["gui"],
    "tool_refs": {"gui": "sim-cli/_skills/sim-cli/gui/SKILL.md"}
  }
}
```

If `tools` doesn't contain `"gui"`, the driver launched headless and
the object is absent — don't call it.

## When to reach for `gui`

Three scenarios dominate:

1. **A blocking dialog is wedging the workflow.** A login prompt,
   overwrite confirmation, or script-error dialog can pause agent work
   until someone clicks a button — that someone is you, via `gui`.
2. **You need to drive the GUI where the SDK can't.** Some workflows
   expose a UI-only surface that the driver API does not cover.
3. **You need a per-window screenshot.** `sim screenshot` captures the
   whole desktop. `SimWindow.screenshot()` captures just the window you
   care about — cheaper to read, less visual clutter for the LLM.

If the SDK has a programmatic path (`session.tui.*`, `model.solve()`,
`ModelUtil.loadCopy()`), prefer that. `gui` is for the UI-only surface
that the SDK doesn't cover.

## Remote equivalence

`gui` is in the session namespace on the `sim serve` side. You talk to
it via the existing `/exec` HTTP channel:

```bash
# local Windows box
sim exec "dlg = gui.find('Login'); dlg.click('OK')"

# Windows box on the LAN / Tailscale
sim --host 10.0.x.y exec "dlg = gui.find('Login'); dlg.click('OK')"
```

No new endpoint, no new protocol — the same API shape from anywhere
the agent runs.

Requirement on the server host: `sim serve` must run in a **real
interactive desktop session** (normal login or RDP). Windows
service / SSH session 0 has no desktop, so pywinauto can't enumerate
any windows even though the solver processes are running. This is the
same constraint GUI-capable drivers document.

## API

### Discover what the controller is looking at

```python
gui.available          # True iff pywinauto can run — check before driving anything
gui.process_filter     # tuple of process-name substrings this gui will target
gui.list_windows()     # {ok, windows: [{hwnd, pid, proc, title, rect}, ...]}
```

### Find a window (polled until timeout)

```python
dlg = gui.find(title_contains="Login", timeout_s=5)
# returns a SimWindow, or None on timeout
```

`title_contains` is a plain substring match (case-sensitive, any language).
Returns `None` if nothing matched — **always check** before calling
methods on it:

```python
dlg = gui.find("连接到")
if dlg is None:
    _result = {"ok": False, "error": "login dialog not visible"}
else:
    dlg.click("确定")
```

### Act on a window

Every action returns `{ok: bool, ...}`. No exceptions unless you pass
invalid Python types — surface `ok=False` + `error` to the agent.

```python
dlg.click("OK", timeout_s=5)             # click a button by accessible name
dlg.send_text("alice", into="Username")  # type into a named Edit field
dlg.send_text("/tmp/out.cas.h5")         # without `into` → first editable
dlg.close()                              # WM_CLOSE (Alt+F4 equivalent)
dlg.activate()                           # bring to foreground
dlg.screenshot(label="after_login")      # window-only PNG under workdir
```

Each action method tries the most natural pywinauto strategy first
(`button_by_title`) and falls back to a broader match
(`any_control_by_title`) before giving up — the response tells you
which path worked via the `strategy` field.

### Full UIA dump

Expensive but sometimes necessary for reasoning about an unfamiliar GUI:

```python
state = gui.snapshot(max_depth=3)
# {ok, windows: [{hwnd, pid, proc, title,
#                  controls: [{name, control_type, handle, children?}, ...]}]}
```

Use this when `find(title)` misses and you need to see what the GUI
actually exposes.

### Handle metadata

`SimWindow` fields you can read without another round-trip:

```python
dlg.hwnd     # int
dlg.pid      # int
dlg.proc     # str, process name
dlg.title    # current window title
dlg.as_dict() # {hwnd, pid, proc, title, rect}
```

## Typical patterns

### Pattern 1 — dismiss a blocking login dialog

```python
dlg = gui.find(title_contains="Login", timeout_s=5)
if dlg:
    dlg.send_text("alice", into="Username")
    dlg.send_text("secret", into="Password")
    dlg.click("OK")
_result = {"dismissed": dlg is not None}
```

### Pattern 2 — confirm a "file exists, overwrite?" dialog

```python
dlg = gui.find(title_contains="Question", timeout_s=3)
if dlg is None:
    dlg = gui.find(title_contains="overwrite", timeout_s=3)  # other
if dlg:
    dlg.click("OK")
_result = {"confirmed": dlg is not None, "title": dlg.title if dlg else None}
```

### Pattern 3 — walk the solver UI tree to find an unexpected control

```python
state = gui.snapshot(max_depth=4)
names = []
def walk(items):
    for c in items:
        if c.get("name"):
            names.append((c["control_type"], c["name"]))
        walk(c.get("children") or [])
for w in state["windows"]:
    walk(w.get("controls") or [])
_result = {"control_names": names[:50]}
```

### Pattern 4 — capture only the solver window for the agent to read

```python
dlg = gui.find(title_contains="Main", timeout_s=3)
if dlg:
    shot = dlg.screenshot(label="after_solve")
    _result = shot  # contains {ok, path, width, height}
else:
    _result = {"ok": False, "error": "main window not found"}
```

## Error handling

Every call returns a dict; failures look like
`{"ok": False, "error": "connect(handle=...) failed: ..."}`. The UIA
machinery runs in an isolated subprocess so a COM glitch in one call
never poisons the next.

Things that commonly make `ok` false:

| Symptom | Likely cause | What to do |
|---|---|---|
| `find` returns `None` | title didn't match / process filter too strict | print `gui.list_windows()` to see what is live |
| `click` says `no control titled ... in hwnd=...` | the button label in the UI is not what you think | snapshot the window, read `controls[*].name` |
| `screenshot` returns minimal PNG | window is minimized (pywinauto captures the window rect; min'd windows live at `(-32000, -32000, …)`) | `dlg.activate()` first, then screenshot |
| `gui.available` is `False` | off-Windows host, or pywinauto not installed | don't use `gui` — fall back to SDK-only path |
| `list_windows()` returns `[]` even though the solver clearly launched | `sim serve` was started from an SSH / non-interactive Windows session — the GUI exists in a session with no display surface and pywinauto can't see it | ask the operator to restart `sim serve` from a desktop session (RDP, Windows Terminal, or Task Scheduler with **"run only when user is logged on" + interactive**). See [`../SKILL.md` → "Where `sim serve` runs"](../SKILL.md). Do **not** retry. |
| `screenshot` returns a uniformly black PNG | same as above — non-interactive session has no compositor | same fix |

## Pitfalls

- **Don't guess button labels.** Windows localisation is real. Use
  `gui.snapshot()` to confirm the actual accessible name before calling
  `click(name)`.
- **Don't assume single window.** Some solvers open extra floating
  panels. `find(title)` returns the first match; if the workflow is
  ambiguous, use `list_windows()` and pick by `pid`.
- **Don't rely on `gui` for SDK-shaped work.** Solver objects (`session`,
  `model`) are always faster and more reliable than UI clicks. `gui` is
  the fallback for the UI-only surface.
- **Remote servers need a real desktop.** If `sim serve` runs from an
  SSH session, a Windows service, or any non-interactive context, the
  spawned solver process inherits a session with no display surface.
  pywinauto then finds zero windows, screenshots come back uniformly
  black, and `find(...)` silently times out — the server itself is up
  and reachable, only the GUI half is dead. Restart `sim serve` from a
  desktop session (Windows Terminal on the console, RDP, or Task
  Scheduler with "run only when user is logged on" + interactive). See
  [`../SKILL.md` → "Where `sim serve` runs"](../SKILL.md) for the full
  driver-by-driver matrix.

## Related skills

- Plugin-specific skills list the dialogs that a given driver is known
  to pop. Check those for recipes before inventing your own.
- `sim.inspect` probes (issue #8a `window_observed`, #8b screenshots)
  tell you **what is on screen** — read them first, then reach for
  `gui` to act.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 215 stars, 22 forks; issue activity unavailable in current metadata
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Permission surface: secrets or environment access, shell or command execution

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Source repository: svd-ai-lab/sim-cli
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Sep 8, 2026
Registry updated: Sep 8, 2026
Instruction path: src/sim/_skills/sim-cli/gui/SKILL.md @ b7318cc3abbe

Version reported in registry metadata; check source releases before relying on it.

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More details

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    "auto_install": {
      "allowed": false,
      "sandbox_required": true,
      "reason": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
    },
    "best_for": [
      "design-creative",
      "agent-skill"
    ],
    "known_risks": [
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Stars/forks activity: 215 stars, 22 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "agent_proven": {
    "version": "agent-proven-v1",
    "score": 0,
    "tier": "unproven",
    "label": "Needs first agent run",
    "summary": "No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.",
    "metrics": {
      "totalOutcomes": 0,
      "successfulOutcomes": 0,
      "failedOutcomes": 0,
      "installAttempts": 0,
      "installSuccessRate": null,
      "successRate": null,
      "recentSuccessRate": null,
      "recentFailureRate": null,
      "riskBlocked": 0,
      "setupRequired": 0,
      "notRelevant": 0,
      "avgOutputQuality": null,
      "avgTimeToUsefulMs": null,
      "productionOutcomes": 0,
      "humanReviewRequired": 0,
      "uniqueAgents": 0,
      "lastOutcomeAt": null
    },
    "signals": [],
    "penalties": [
      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 78,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Stars/forks activity: 215 stars, 22 forks; issue activity unavailable in current metadata",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 70,
    "label": "Strong"
  },
  "supply": {
    "track": "Design and creative production",
    "scenario": "Design and creative",
    "maintenance": "9d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Quality score needs review",
    "Permission surface needs review: secrets or environment access, shell or command execution"
  ],
  "agent_contract": {
    "task_input": "Use gui in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 73/100 Strong shortlist",
      "Audit: 78/100 Needs review",
      "Safety: 38/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "svd-ai-lab-gui (gui)",
      "install_command": "npx skills add svd-ai-lab/sim-cli --skill gui",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "svd-ai-lab-gui",
      "task": "Use gui in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/svd-ai-lab-gui",
    "api": "https://www.openagentskill.com/api/agent/skills/svd-ai-lab-gui",
    "audit": "https://www.openagentskill.com/skills/svd-ai-lab-gui/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=svd-ai-lab-gui&task=Use%20gui%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20gui%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20gui%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/svd-ai-lab-gui/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/svd-ai-lab-gui"
  }
}

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Creator: svd-ai-lab
Source: svd-ai-lab/sim-cli
Indexed by: OpenAgentSkill community index

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